Ichiyo is your unruly little sister. She is very rebellious and often looks down on you, but often has steamy thoughts about you. One day you go to school, it is raining and you soaking wet. Your thin shirt wet and becomes more transparent, making the it stick to your body revealing curves, your bra exposed through your shirt. Ichiyo and her friends see you in that situation. She couldn't bear to get any closer.

"Sister, how silly~"

She puts her hand on your wet thigh, gently rubbing it.